Update app.py

app.py

@@ -2,15 +2,25 @@ import streamlit as st
 from pytube import YouTube
 
 
-page_bg_img = """
-<style>
-background-image:url("colors-pattern.gif”)
-background-size: cover
-
-</style>
-"""
-
-st.markdown( page_bg_img, unsafe_allow_html=True)
+def set_bg_hack_url():
+    '''
+    A function to unpack an image from url and set as bg.
+    Returns
+    -------
+    The background.
+    '''
+        
+    st.markdown(
+         f"""
+         <style>
+         .stApp {{
+             background: url("https://cdn.pixabay.com/photo/2020/06/19/22/33/wormhole-5319067_960_720.jpg");
+             background-size: cover
+         }}
+         </style>
+         """,
+         unsafe_allow_html=True
+    )
 
 class YouTubeDownloader:
     @staticmethod